linux-kernel - [PATCH 0/2] x86/mm: Make memremap(MEMREMAP_WB) map memory as encrypted by default

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Message-ID: <20241017155642.1942514-1-kirill.shutemov@linux.intel.com>
Date: Thu, 17 Oct 2024 18:56:40 +0300
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
To: Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	x86@...nel.org,
	"H. Peter Anvin" <hpa@...or.com>,
	Andy Lutomirski <luto@...nel.org>
Cc: Albert Ou <aou@...s.berkeley.edu>,
	Alexei Starovoitov <ast@...nel.org>,
	Andrea Parri <parri.andrea@...il.com>,
	Arnd Bergmann <arnd@...db.de>,
	Daniel Borkmann <daniel@...earbox.net>,
	Eric Chan <ericchancf@...gle.com>,
	Jason Gunthorpe <jgg@...pe.ca>,
	Kai Huang <kai.huang@...el.com>,
	Kefeng Wang <wangkefeng.wang@...wei.com>,
	Kent Overstreet <kent.overstreet@...ux.dev>,
	Palmer Dabbelt <palmer@...osinc.com>,
	Paul Walmsley <paul.walmsley@...ive.com>,
	Russell King <linux@...linux.org.uk>,
	Samuel Holland <samuel.holland@...ive.com>,
	Suren Baghdasaryan <surenb@...gle.com>,
	Yuntao Wang <ytcoode@...il.com>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	linux-riscv@...ts.infradead.org,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: [PATCH 0/2] x86/mm: Make memremap(MEMREMAP_WB) map memory as encrypted by default

Make memremap(MEMREMAP_WB) produce encrypted/private mapping by default
unless MEMREMAP_DEC is specified.

It fixes crash on kexec in TDX guests if CONFIG_EISA is enabled.

Kirill A. Shutemov (2):
  memremap: Pass down MEMREMAP_* flags to arch_memremap_wb()
  x86/mm: Make memremap(MEMREMAP_WB) map memory as encrypted by default

 arch/arm/include/asm/io.h   | 2 +-
 arch/arm/mm/ioremap.c       | 2 +-
 arch/arm/mm/nommu.c         | 2 +-
 arch/riscv/include/asm/io.h | 2 +-
 arch/x86/include/asm/io.h   | 3 +++
 arch/x86/mm/ioremap.c       | 8 ++++++++
 kernel/iomem.c              | 5 +++--
 7 files changed, 18 insertions(+), 6 deletions(-)

-- 
2.45.2